content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
  import io.reactivex.rxjava3.internal.subscriptions.DeferredScalarSubscription;
  
  /**
   * Wrap a Maybe into a Perhaps.
   *
   * @param <T> the value type
   */
  final class PerhapsFromMaybe<T> extends Perhaps<T> {
  
      final MaybeSource<T> source;
  
      PerhapsFromMaybe(MaybeSource<T> source) {
          this.source = source;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          source.subscribe(new FromMaybeObserver<T>(s));
      }
  
      static final class FromMaybeObserver<T> extends DeferredScalarSubscription<T> implements MaybeObserver<T> {
  
          private static final long serialVersionUID = 1184208074074285424L;
  
          Disposable upstream;
  
          FromMaybeObserver(Subscriber<? super T> downstream) {
              super(downstream);
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              if (DisposableHelper.validate(this.upstream, d)) {
                  this.upstream = d;
  
                  downstream.onSubscribe(this);
              }
          }
  
          @Override
          public void onSuccess(T value) {
              complete(value);
          }
  
          @Override
          public void onError(Throwable e) {
              downstream.onError(e);
          }
  
          @Override
          public void onComplete() {
              downstream.onComplete();
          }
  
          @Override
          public void cancel() {
              super.cancel();
              upstream.dispose();
          }
      }
  }
  